Description of problem:
having installed a new f16 system i was unable to login, im connected to a freeipa server for auth. turned out it was because of the change to minimum uids of 1000 in f16. pam_unix auth failed but pam_sss auth was not attempted. there was no warning or logging to indicate that auth type was skipped. it was being skipped because my uid is 504 after changing the miniums back to 500 i was able to log in. but spent a lot of time trying to debug something that i should have had a logged warning about that would have enabled me to debug and resolve the issue in minutes instead of hours.
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I suggest that we might want to modify Fedora's copy of pam_unix.so so that if it receives an ID in the old range (500-999) we will print a warning in /var/log/secure that it may interact poorly with the default PAM configuration.